We loop through the row of pixels and place the sampled RGB pixels in the samples array, convert the RGB samples to YUV and grab the Y or brightness value for comparison against a rough gradient of ASCII values. For best results, use a monospace font to retain proper spacing.

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Invisible Cape

In this video tutorial, Creative Cow contributing editor Eran Stern with the help of his brother Yuval will show you a simple method to create the famous invisible look inspired from the movie "The Predator"